ICON V.S. 2.5 Aluminum Rear Shocks Piggyback CDCV for 1999-2026 Ford F-250 F-350 F-450 Super Duty 0-3 in Lift Pair

The ICON Vehicle Dynamics V.S. 2.5 Aluminum Series rear shocks with piggyback reservoir and CDC Valve are application-specific performance shocks for 1999–2026 Ford F-250, F-350, and F-450 Super Duty trucks running 0–3 inches of rear lift over stock, sold as a pair. Each shock is length- and valving-tuned for this exact application, built from 6061 aircraft-grade aluminum, and designed to deliver controlled, fade-resistant damping on dirt and pavement alike. Note: these shocks do not fit F-350 or F-450 cab and chassis models.

Shipping: ICON parts ship direct from ICON Vehicle Dynamics, mostly by UPS Ground. Lead times vary by part and some items are built to order, so please allow extra time. We email tracking as soon as your order ships.

10-Level Compression Adjustability On the Trail

The ICON CDC Valve is an externally adjustable valve that restricts oil flow into the piggyback reservoir, producing 10 distinct levels of compression damping force with a single knob turn. That range lets a Super Duty owner dial in a softer setting for loaded highway miles and a firmer setting for high-speed washboard or rock crawling without pulling a shock or changing a spring. Because the adjustment is external, it takes seconds rather than a shop visit.

Bump Zone Technology Prevents Harsh Bottom-Outs

A 6061 billet aluminum manifold positioned below the top cap creates an internal Bump Zone that adds 20% of damping force as the shock approaches full compression. On a heavy-duty truck carrying payload or towing, that progressive resistance absorbs the energy of hard hits before the suspension runs out of travel, protecting both the truck and its cargo. The nitrogen-charged monotube design keeps oil and gas separated for consistent response across repeated compression cycles.

Built to Be Serviced, Not Replaced

The V.S. 2.5 Aluminum Series shocks are 100% rebuildable and 100% revalveable. One-piece impact-extruded aluminum cylinders resist corrosion and hold tight tolerances over time. Premium 5-weight shock oil maintains consistent damping across a wide temperature range, and PTFE-lined spherical bearings at the mounting points reduce friction and wear. A 7/8-inch induction-hardened, chrome-plated shock shaft handles the side loads a lifted Super Duty generates without bending or scoring.

Features

• CDC Valve: externally adjustable compression damping with 10 distinct force levels
• Internal Bump Zone: 6061 billet aluminum manifold adds 20% damping force near full compression
• Piggyback reservoir: nitrogen-charged monotube design with remote reservoir for improved heat dissipation and reduced shock fade
• 7/8 in shock shaft: induction-hardened, chrome-plated for durability under load
• PTFE spherical bearings: low-friction mounting with application-specific hardware included
• 100% rebuildable and revalveable: fully serviceable with one-piece CNC-machined aluminum components

Specifications

Who This Is For and Isn't

These shocks suit 1999–2026 Ford F-250, F-350, and F-450 Super Duty owners running 0–3 inches of rear lift who want externally adjustable, rebuildable performance damping for mixed on-road and off-road use.

These shocks do not fit F-350 or F-450 cab and chassis models. They are rear-position shocks only and are not compatible with rear lift heights outside the 0–3 inch range stated for this application.

Common Questions

What model years and configurations does this shock fit?

These ICON V.S. 2.5 Aluminum Series rear shocks fit 1999–2026 Ford F-250, F-350, and F-450 Super Duty trucks with 0–3 inches of rear lift over stock. They do not fit F-350 or F-450 cab and chassis models.

How does the CDC Valve compression adjustment work?

The CDC Valve on these ICON shocks is an externally accessible knob that restricts oil flow into the piggyback reservoir. Turning it cycles through 10 levels of compression damping force, letting the driver firm up the rear end for off-road use or soften it for loaded highway driving without removing the shock.

What is the Bump Zone and why does it matter on a heavy-duty truck?

The Bump Zone is an internal feature created by a 6061 billet aluminum manifold below the top cap. As the shock nears full compression, it generates an additional 20% of damping force. On a loaded Super Duty, this progressive resistance absorbs hard hits before the suspension bottoms out, reducing impact transferred to the frame and cab.

Are these shocks rebuildable, and what does that mean for long-term ownership?

These ICON V.S. 2.5 Aluminum Series shocks are 100% rebuildable and 100% revalveable, meaning worn seals, oil, and valving can be serviced rather than requiring full shock replacement. The one-piece CNC-machined aluminum construction and corrosion-resistant cylinder support long service life.